使用JDialog,参照Windows记事本编写一个“字体”对话框

好的，我可以帮你回答这个问题。

使用JDialog可以创建一个自定义的对话框，在这个对话框中我们可以添加各种组件以达到我们的需求。

下面是参照Windows记事本编写的一个“字体”对话框的示例代码：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;

public class FontDialog extends JDialog {
    private JLabel fontLabel, styleLabel, sizeLabel, previewLabel;
    private JComboBox fontComboBox, styleComboBox, sizeComboBox;
    private JTextArea previewTextArea;
    private JButton okButton, cancelButton;
    private Font font;

    private String[] fontList = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();
    private String[] styleList = {"常规", "粗体", "斜体", "粗斜体"};
    private String[] sizeList = {"8", "9", "10", "11", "12", "14", "16", "18", "20", "22", "24", "26", "28", "36", "48", "72"};

    public FontDialog(Frame parent, Font font) {
        super(parent, "字体", true);
        this.font = font;

        JPanel mainPanel = new JPanel(new BorderLayout());
        JPanel fontPanel = new JPanel();
        JPanel stylePanel = new JPanel();
        JPanel sizePanel = new JPanel();
        JPanel previewPanel = new JPanel(new BorderLayout());
        JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));

        fontLabel = new JLabel("字体(F):");
        styleLabel = new JLabel("字形(Y):");
        sizeLabel = new JLabel("大小(S):");
        previewLabel = new JLabel("预览:");
        fontComboBox = new JComboBox(fontList);
        styleComboBox = new JComboBox(styleList);
        sizeComboBox = new JComboBox(sizeList);
        previewTextArea = new JTextArea("AaBbCcYyZz", 6, 20);
        okButton = new JButton("确定");
        cancelButton = new JButton("取消");

        fontComboBox.setSelectedItem(font.getName());
        styleComboBox.setSelectedIndex(font.getStyle());
        sizeComboBox.setSelectedItem(String.valueOf(font.getSize()));

        fontPanel.add(fontLabel);
        fontPanel.add(fontComboBox);

        stylePanel.add(styleLabel);
        stylePanel.add(styleComboBox);

        sizePanel.add(sizeLabel);
        sizePanel.add(sizeComboBox);

        previewPanel.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createLineBorder(Color.GRAY), BorderFactory.createEmptyBorder(5, 5, 5, 5)));
        previewPanel.add(previewLabel, BorderLayout.NORTH);
        previewPanel.add(new JScrollPane(previewTextArea), BorderLayout.CENTER);

        buttonPanel.add(okButton);
        buttonPanel.add(cancelButton);

        mainPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        mainPanel.add(fontPanel, BorderLayout.NORTH);
        mainPanel.add(stylePanel, BorderLayout.CENTER);
        mainPanel.add(sizePanel, BorderLayout.SOUTH);
        mainPanel.add(previewPanel, BorderLayout.WEST);
        mainPanel.add(buttonPanel, BorderLayout.SOUTH);

        this.setContentPane(mainPanel);
        this.pack();
        this.setLocationRelativeTo(null);

        okButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                font = new Font((String) fontComboBox.getSelectedItem(), styleComboBox.getSelectedIndex(), Integer.parseInt((String) sizeComboBox.getSelectedItem()));
                FontDialog.this.dispose();
            }
        });

        cancelButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                FontDialog.this.dispose();
            }
        });

        previewTextArea.setFont(font);
        fontComboBox.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                previewTextArea.setFont(font);
                previewTextArea.repaint();
            }
        });

        styleComboBox.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                previewTextArea.setFont(font);
                previewTextArea.repaint();
            }
        });

        sizeComboBox.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                previewTextArea.setFont(font);
                previewTextArea.repaint();
            }
        });
    }

    public Font getFont() {
        return font;
    }
}

通过运行以下代码进行测试：

public class TestFontDialog {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Test FontDialog");
        JTextField textField = new JTextField("测试字体对话框");
        JButton button = new JButton("字体");
        Font font = textField.getFont();
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                FontDialog dialog = new FontDialog(frame, font);
                dialog.setVisible(true);
                textField.setFont(dialog.getFont());
            }
        });
        JPanel panel = new JPanel();
        panel.add(textField);
        panel.add(button);
        frame.setContentPane(panel);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

以上示例会在一个JFrame中显示一个JTextField和一个“字体”按钮，点击按钮会弹出一个“字体”对话框，可以选择字体、字形和大小，预览也会更新。

希望这个示例代码能够帮到你，如果有任何疑问，请随时问我。